Full will have the ability to be summoned by Free Companies after meeting certain conditions. (Likely involving encountering Primals out in some sort of FATE event.) The details of this is not out yet, of course.

And quit griping about Egi's already. We're past the point of it being worth the post you waste on it.

More importantly, note the white hair on Odin in it's first couple images - look how much effort they put into hiding the face.